After upgrading from 15.10 to 16.04, I can't connect to my university's wifi (eduroam), which uses WPA2 Enterprise security. I'm certain the passwords and settings are all correct, and I had no trouble using the network with 15.04 and 15.10. As a matter of fact I even upgraded through that wifi, so I asked the IT department if they had changed anything just in case, which they haven't.
I have no trouble connecting to other Wifi networks, or detecting networks.